<template>
<view>
  <view class="search-box">
    <uni-search-bar @input="input" :radius="100" placeholder="请输入搜索内容" cancelButton="none"></uni-search-bar>
  </view>
  <!-- 搜索建议列表 -->
  <view class="sugg-list" v-if="searchResults.length !== 0">
    <view class="sugg-item" v-for="(item, i) in searchResults.goods" :key="i" @click="gotoDetail(item)">
      <view class="goods-name">{{item.goods_name}}</view>
      <uni-icons type="arrowright" size="16"></uni-icons>
    </view>
  </view>
  <!-- 搜索历史 -->
  <view class="history-box" v-else>
    <!-- 标题区域 -->
    <view class="history-title">
      <text>搜索历史</text>
     <uni-icons type="trash-filled" size="17" @click="cleanHistory"></uni-icons>
    </view>
    <!-- 列表区域 -->
    <view class="history-list">
      <uni-tag :text="item"v-for="(item,i) in  historyList" :key="i" @click="gotoGoodsList(item)"></uni-tag>
    </view>
  </view>
</view>
</template>

<script>
  export default {
    data() {
      return {
        // 延时器的 timerId
            timer: null,
            // 搜索关键词
            kw: '',
            //搜索结构列表
            searchResults:[],
             // 搜索关键词的历史记录
             historyList: ['a', 'app', 'apple']
      };
    },
    onLoad(){
      this.historyList = JSON.parse((uni.getStorageSync('kw') || '[]'))
    },
    methods:{
      input(e){
        // 清除 timer 对应的延时器
         clearTimeout(this.timer)
          // 重新启动一个延时器，并把 timerId 赋值给 this.timer
          this.timer = setTimeout(() => {
            // 如果 500 毫秒内，没有触发新的输入事件，则为搜索关键词赋值
            this.kw = e
            console.log(this.kw)
            this.getSearch()
          }, 500)
      },
      async getSearch(){
        if(this.kw.length ===0){
          this.searchResults=[]
          return
        }
        //发起请求，获取搜索建议列表
        const {data:res} = await uni.$http.get('/api/public/v1/goods/search',{query :this.kw})
        if (res.meta.status !== 200) {
          return uni.$showMsg()
        }
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      // 点击跳转到商品详情页
      gotoDetail(item){
        uni.navigateTo({
          url:'/subpkg/goods_detal/goods_detal?goods_id=' +item.goods_id
        })
        // console.log(item.goods_id)
      },
      // 2. 保存搜索关键词的方法
       saveSearchHistory() {
         // this.historyList.push(this.kw)
         const set = new Set(this.historyList)
         set.delete(this.kw)
         set.add(this.kw)
         this.historyList=Array.from(set)
         uni.setStorageSync('kw',JSON.stringify(this.historyList))
       },
       cleanHistory(){
         this.historyList =[]
         uni.setStorageSync('kw','[]')
       },
       gotoGoodsList(kw){
         uni.navigateTo({
           url:'/subpkg/goods_list/goods_list?query=' +kw
         })
       }
    }
  }
</script>

<style lang="scss">
  .search-box{
    position: sticky;
    top:0;
    z-index: 999;
  }
  .sugg-list{
    padding: 0 5px;
    
    .sugg-item {
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      align-items: center;
      justify-content: space-between;
      
      .goods-name {
         // 文字不允许换行（单行文本）
        white-space: nowrap;
         // 溢出部分隐藏
        overflow: hidden;
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
   }
    .history-box {
      padding: 0 5px;
      
      .history-title {
        display: flex;
        justify-content: space-between;
        align-items: center;
        height: 40px;
        font-size: 13px;
        border-bottom: 1px solid #efefef;
      }
      .history-list {
        display: flex;
        flex-wrap: wrap;
          
          .uni-tag {
            margin-top: 5px;
            margin-right: 5px;
          }
      }
    }
 
</style>
